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Contains:  NGC 3628, M 66, NGC 3627, M 65, NGC 3623, NGC 3593, The star 73Leo
Getting plate-solving status, please wait...
The Leo Triplet and friends, 





    
        

            Andrew Klinger
The Leo Triplet and friends

The Leo Triplet and friends

Technical card

Resolution: 4250x3130

Dates:March 14, 2018

Frames:
ZWO B 1.25": 77x180" (gain: 76.00) -20C bin 1x1
ZWO G 1.25": 61x180" (gain: 76.00) -20C bin 1x1
ZWO L 1.25": 262x180" (gain: 76.00) -20C bin 1x1
ZWO R 1.25": 53x180" (gain: 76.00) -20C bin 1x1

Integration: 22.6 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 26.63 days

Avg. Moon phase: 9.20%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2053017

RA center: 169.437 degrees

DEC center: 13.065 degrees

Pixel scale: 2.025 arcsec/pixel

Orientation: 359.802 degrees

Field radius: 1.485 degrees

Locations: Atoka dark site, Atoka, Oklahoma, United States

Data source: Unknown

Description

Equipment:
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

Software:
SGP
PHD2
CdC
PixInsight

Acquisition:
Location: Atoka, Oklahoma (Bortle 3)
Dates: 1/16/2018, 2/17/2018, 3/11/2018, 3/12/2018, 3/14/2018
Gain: 76 Offset: 15
Camera temp: -20C
L: 262x180"
R: 53x180"
G: 61x180"
B: 77x180"
Total integration time: 22hr 39min
64x darks per calibration
30x flats per calibration
200x bias (master bias in library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment to register all frames to a reference L
LocalNormalization per channel
ImageIntegration
DrizzleIntegration
DynamicCrop each master
DBE on each master

RGB processing:
BackgroundNeutralization
ColorCalibration using the galaxies as the white balance
SCNR green 50%
ArcsinhStretch
HistogramTransformation x2
SCNR green 100%
CurvesTransformation for saturation

L processing:
Deconvolution
HistogramTransformation
MaskedStretch
LocalHistogramEqualization
MultiscaleLinearTransform for sharpening
CurvesTransformation for contrast

Combined L and RGB with LRGBCombination tool
Resampled to 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
2832
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The Leo Triplet and friends, 





    
        

            Andrew Klinger